1. Here 服 means to submit, to capitulate, to yield; to relent, to give up, be impressed by etc. "With her, I have to throw in the towel"
2. Who knows that one day she has to rely on men!
3. Seems that she is just look at the scenery. There are many meanings of 风光 = doing well, outer appearance, Need more context to discern what the sentence really means. So I am giving the most literal one.
4. Finally, hard work pays off (to those who are resolute)